How Should the Thickness of Corner GRC Components Be Handled?

The thickness treatment of GRC corner components (such as internal corners and external corners) is a comprehensive design challenge that balances "structural safety, installation strength, visual performance, and thermal performance"—it is by no means simply continuing the thickness of the adjacent wall. Improper treatment can easily lead to stress concentration at corners, weak installation, pronounced thermal bridging, and even cracking. Through extensive corner practice in projects such as the Wuhan Han Show Theater and the Shenzhen Pingshan High-tech Zone Comprehensive Service Center, Qinglong Group has summarized the core treatment principles of "integrated structural reinforcement, thermal bridge breaking or weakening, and visual effect optimization", ensuring that corners are both sturdy and durable, as well as aesthetically pleasing and harmonious.

Structural Reinforcement: The Key to Resisting Stress Concentration

Corners are stress concentration areas and are prone to damage under wind loads, temperature deformation, and installation stresses. Therefore, the thickness of GRC components at corners usually needs to be increased, or internal reinforcement applied. For external corners, two methods are commonly used: 1) Integral thickening: locally thickening the corner area to about 1.5 times the thickness of the adjacent flat panel, forming a "stiffening rib". 2) Built-in steel framework: embedding an L-shaped or square-tube steel framework inside the corner to share the load with the GRC; in this case, the GRC thickness can remain unchanged, mainly serving to encase and protect it. For internal corners, the key is to ensure that the GRC is densely filled at the corner to avoid voids and weak points.

Thermal Bridge Breaking Design: Improving Corner Thermal Performance

In energy-efficient buildings, concrete corners are typical thermal bridge locations. Qinglong's treatment solutions include: 1) Using thermal-bridge-breaking connectors: even if the corner GRC panel is thick, its connection to the main structure is achieved through nylon or stainless steel thermal-bridge-breaking anchors, cutting off metal thermal bridges. 2) Designing a "separated internal and external corner" configuration: designing the internal or external corner as two independent components with an air cavity in between or insulation material filled in, significantly reducing heat transfer. 3) External insulation wrapping: covering the outside of the corner GRC panel with integrated insulation and decorative panels, completely enclosing the corner within the insulation layer.

Refined Treatment of Visual Effects

Corner thickness directly affects the building's "edge finishing" effect. An external corner that is too thick appears bulky, while one that is too thin looks fragile. Qinglong's designers determine the visual proportions of corners according to the building's overall style. For modern minimalist styles, "sharp external corners" are often used, achieving crisp edges and uniform thickness through precise mold control. For classical or stone-imitation styles, the external corner may be "chamfered" or "rounded", creating the sense of thickness of stone materials; in this case, thickness treatment must be carried out in sync with surface texture design.

Reliability Design of Installation Nodes

Corner components have many installation points and complex load conditions. A reliable embedded fixing system and connection nodes must be designed. Typically, embedded parts are provided on both sides of the corner, with their quantity and positions determined through calculations to ensure the components remain stable during hoisting and long-term use. Joint sealing at corners also requires special design—using high-elasticity sealant and setting appropriate joint widths to accommodate deformation. Scientific thickness and structural design is the foundation for the successful application of GRC corners.